What does ICD-10 code F31 mean?

ICD-10 code F31 is the standardized code used for bipolar disorder in medical records and coding systems.

When is ICD-10 code F31 used?

Doctors, hospitals, and insurers may use ICD-10 code F31 when recording bipolar disorder in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code F31 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code F31: Bipolar disorder

Name: ICD-10 Code F31: Bipolar disorder
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:06:21.930Z

F31 is an ICD-10 diagnosis entry used to group records related to Bipolar disorder. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Mental, Behavioral and Neurodevelopmental disorders (F01-F99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Mental, Behavioral and Neurodevelopmental disorders (F01-F99).

When is it used?

May be used when a clinician documents bipolar disorder in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

5Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

block

F30-F39Mood [affective] disorders

currentF30-F39

Official coding notes

Includes

bipolar I disorder
bipolar type I disorder
manic-depressive illness
manic-depressive psychosis
manic-depressive reaction
seasonal bipolar disorder

Excludes1 (do not code together)

bipolar disorder, single manic episode (F30.-)
major depressive disorder, single episode (F32.-)
major depressive disorder, recurrent (F33.-)

Excludes2 (may code together if documented)

cyclothymia (F34.0)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Sibling codes

F30Manic episode F32Depressive episode F33Major depressive disorder, recurrent F34Persistent mood [affective] disorders F39Unspecified mood [affective] disorderbillable

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

F31

Replacement codes

F31.0 — Bipolar disorder, current episode hypomanicF31.2 — Bipolar disorder, current episode manic severe with psychotic featuresF31.4 — Bipolar disorder, current episode depressed, severe, without psychotic featuresF31.5 — Bipolar disorder, current episode depressed, severe, with psychotic featuresF31.9 — Bipolar disorder, unspecified

Common synonyms

Bipolar disorder

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.